Peptamen 1 Cal Complete Calorically Dense Whey Peptide Based Formula. This formula is ready to use for complete or supplemental tube feeding. It is specifically formulated for easy digestion and absorption for patients with impaired gastrointestinal function and normal or increased caloric requirements. Peptamen is also useful as a nocturnal feeding, as a dual feeding with TPN or as a transition diet from TPN. 1000 mL/SpikeRight container, 6/case.